Beat-up mechanism of looms for weaving



J l 31 1945 D. w. SHIMWELL 2,380,798

BEAT-UP MECHANISM OF LOOMS FOR WEAVING Filed July 26, 194 4 2Sheets-Sheet l \w i f T i a 35E? kzlmzzel,

y 1; 1945- D. w. SHIMWELL BEAT-UP MECHANISM OF LOOM-S FOR WEAVING FiledJuly 26, 1944 2 Sheets-Sheet 2 Ila/$22101 I .132, SfiZZZLZZEZZ PatentedJuly 31, 1945 BEAT-UP MECHANISM OF LOOMS FOR WEAVING Derrick WalterShimwell, Alderley Edge, England Application July 26, 1944, Serial No.546,613 In Great Britain August 17, 1943 3 Claims.

This invention relates to the beat-up mechanism of looms for weaving ofthe type in which a beat-up comb enters the warp threads from above toeffect the beat-up operation as claimed in my prior application forpatent, Serial No. 522,609 filed February 16, 1944.

The object of the present invention is to provide improved means forimparting the desired movement to the beat-up comb and for stopping theloom if the shuttle is not boxed at beat-up.

The invention comprises mounting the beat-up comb between the upstandingparts of two frames, one at each side ofthe loom, the base part of eachframe providing at its rearward end a journal bearing for a crank pinand being supported at its forward end by an arm movable back and forthabout a fixed fulcrum to opposite sides of a vertical position anddwelling or moving slowly at its extreme positions whilst the crank pinrises and falls respectively through a relatively large angle, soensuring that the beat-up comb has a relatively rapid upward movement toeffect beatup and to leave the warp shed and then after 'a movementbackwards clear of the warp shed a relatively rapid downward movement toenter the warp shed adjacent to the reed.

The invention further comprises the provision upon the base part of eachframe of a catch tooth adapted to engage a catch when the frame ismoving forward to the beat-up position if the shuttle is not intheshuttle box, the said catch being operatively connected to theshuttlebox swell and to the loom knock-off handle, and the crank pin at therearward end of the frame being allowed to continue its movement againstspring pressure, when the frame is stopped.

Referring to the accompanying explanatory drawings:

Figure 1 is a general view of al ooffi beat-up and knock-oil mechanismarranged in one convenient form in accordance with this invention. Thebeat-up comb is shown on its rearward traverse about to enter. the warpshed. The knockof! mechanism is shown in the positionit occupies whenthe shuttle is not in the shuttle box.

Figure 2 is a view similar to Figure 1 but showing the beat-up comb inthe warp shed just prior to beat-up. The knock-oi! mechanism is shown inthe position it occupies when the shuttle is in the box. The beat-upcomb a is bolted to a T section bar 12 extending across the loom andbolted at The rearward end of the latter has a cap e thereon for thejournal bearing of the crank pin 1. One bearing brass g is in the capand the other bearing brass h is in a block 1 which can slide againstthe pressure of the spring 7' in a recess k "in the base portion d ofthe side frame. The crank pin 1 is upon an arm m which turns with thecrank shaft n. The forward end of the base portion d of each side frameis pivotally connected to an arm 0 which turns about a fixed axis at p.

The loom reed is shown at q, and the slay upon which the shuttle ridesin its flight through the warp shed is shown at r. The warp threadsconstituting the shed are shown at s. the path of the point of thebeat-up comb as it moves downwards into the shed, then forwards, andfinally upwards to efl'ect beat-up and to leave the warp threads.

Each arm 0 moves during the turning of the crank shaft n from one to theother side of a vertical position and it dwells in its extreme positionsas the crank arm m moves from one to 'the other side of a planecontaining (1) the pivotal connection of the arm 0 to the base portion dof the side frame, (2), the axis of the crank shaft n and (3) the axisof the crank pin f. The

effect of the disposition of parts described is that when the comb a isapproaching the beat=up position as shown in Figure 2, it has arelatively rapid upward movement to efiect beat-up and to leave the warpshed and when it is approaching the point of entry into the shed asshown in Figure 1, it has a relatively rapid downward movement. Theserapid upward and downward movements are due to the fact that the arms 0are relatively stationary whilst the crank arm m has a comparativelylarge angular movement either p d or downward.

The importance of the aforesaid rapid upward and downward movements isthat the beat-up comb leaves the warp shed rapidly after beat-up andneednot re-enter the shed again until it is approaching the reed q. Thisenables the shuttle to be in the shed during a largepart of the loomcycle so that though such cycle may be considerably speeded up incomparison with the usual loom cycle, the shuttle speed need not beincreased. The wear and tear and faults due to increase of shuttle speedrender the latter uneconomical. With my construction the shuttle canenter the shed before beat-up is completed.

itsends-to two frames, one at each side of the Y The comb a and reed qmay be of ordinary construction.

Each shuttle box ,has the usual swell u therein which is pressedoutwards from the box when the t indicates shuttle is in the box. Theswell engages one arm v of a bell crank lever, the other arm 11) ofwhich is coupled by the link a: to a catch 1 pivoted to a block 2 heldagainst a stop 2 by a spring 3 and capable of a limited movement up tothe stop H against the pull of the spring 3 in order to push the loomstarting and knock-oi! handle 1 into the loom stop" or "knock-01fposition which causes, in the known manner, the loom drive to bedisconnected or the power to be cut off and a brake applied; There aretwo blocks a and two catches y secured to a shaft journalled at WhatIclaim is:

1. In a loom beat-up mechanism, mounting the beat-up comb between theupstanding parts of two frames, one-at each side of the loom, the basepart of each frame providing at its rearward end a journal bearing for acrank pin and being supported at its forward end by an arm movable backand forth about a fixed fulcrum to opposite sides of a vertical positionand dwelling or moving slowly at its extreme positions whilst the crankpin rises and falls respectively through a relatively large angle, soensuring that the beat-up comb has a relatively rapid upward movement toeffect beat-up and to leave the warp shed and then after a movementbackwards clear of the warp shed a relatively rapid downward movement toenter the warp shed adjacent to the reed.

2. In a loom beat-up mechanism as claimed in claim 1, the'provision uponthe base part of each frame of a catch tooth adapted to engage a catchwhen the frame is moving-forward to the beatare in the raised positionas shown in Figure 1 and will be engaged by the teeth 5 (when the sideframes move forward) as shown by dotted lines. The movement of theblocks 2 to operate the knock-ofl handle 4 is small. Thereafter theblocks and catches holdtheside frames with the teeth 5 thereon againstmovement towards the beat-up position. The crank shaft n, however,continues to turn to a limited extent before knock-off and stoppage ofthe loom is complete, but the movement of the crank pins 1 merely causesa movement of the bearing brasses h and blocks i against the pressure ofthe springs the side frames remainingstationary. when the side frame ismoving backwards,-each catch tooth 5 is'lifted clear of its cooperatingcatch.

up position if the shuttle is not in the shuttle box, the said catchbeing operatively connected to the shuttle box swell and to the loomknock-oil! handle, and the crank pin at the rearward end of the framebeing allowed to continue its movement against spring pressure, when theframe is stopped.

3. In a loom beat-up mechanism as claimedin claim 1, Journalling eachcrank pin in its side frame in a fixed bearing brass and a movablebearing brass,' the latter moving with the crank pin against springpressure when the motion of the side frame is stopped by the knock-of!mechanism.

DERRICK WALTER. SHIMWELL.

